Patent GB-1335670-A (GB)
Title: Justifier mechanism for a typewriter or the like
Inventor: HORVATH G
IPC: B41J19/64
Filed: 1970-11-02
Abstract: 1335670 Typewriters IRODAGEPIPARI ES FINOMMECHANIKAI VALLALAT 2 Nov 1970 [31 Oct 1969] 52073/70 Addition to 1237403 Heading B6F Justifying.-As in the parent Specification, 1,237,403, a method of producing justified lines of type comprises distributing the number of basic units constituting the difference between an unjustified line of text and a predetermined line length amongst all the word spaces in a line such that adjacent spaces differ in length by no more than one basic unit. The present invention differs from the parent in that the plurality of programme paths is replaced by one basic programme path adapted to simulate each of said plurality of programme paths, there being a starting position on the basic programme path for each possible combination of interword spaces and difference in length between an unjustified and justified line. Each starting position on the basic programme is represented by a number read from the cylinder (29, Fig. 15) of an indicator illustrated in (Figs. 14 to 17). During typing of an unjustified line, the cylinder of the indicator is stepped by a ratchet mechanism at every interword space, and the total number of interword spaces is indicated in a window (39, Fig. 17) on the facia of the indicator. As the end of line approaches, a sliding contact (K, Fig. 14) attached to carriage of the typewriter, moves over fixed contacts 28 to 0 representing the basic units of space remaining. Lamps 28 to 0 corresponding to the fixed contacts are selectively illuminated on the facia of the indicator to indicate what number on the cylinder (29) should be read through a window (41). As stated above, this number represents the starting position to be selected on the basic programme for providing the correct interword spacing for a justified line. Two embodiments are described for the justifier, one mechanical (Figs. 5 to 10) and one electrical (Figs. 11 to 13), both using three cam discs fixed relative to each other on a shaft, which shaft is set in accordance with the number read from the indicator. The profiles of the coin discs represent the basic programme path. In the mechanical embodiment, the three discs (1, Fig. 6) are rotatably mounted on the shaft (3) of a setting knob (2) (Fig. 5). The shaft (3) carries a further disc (4) which performs the transmitting functions required for positional adjustment, a pin (5) on the disc (4) engaging a fork (19) connected to the discs (1) and keeping them in position with the aid of a spring (6). Levers (7, 8, 9, Fig. 6) form a four element linkage. The lever (7) is directly connected to the spacing mechanism and lever (9) to the stop of the interword spacing mechanism. An angled end (17) of lever (8) constitutes the cam follower for the three discs (1) which can turn in relation to the disc (4). In the electrical embodiment, electromagnets (M L1 , M L2 , M L3 , Fig. 11) displace stops of the interword spacing mechanism. Three switches E 1 , E 2 , E 3 , Fig. 13, are controlled by the three cam discs on the programming drum 1. Once the discs have been angularly set with respect to the switches E 1 , E 2 , E 3  in accordance with the number obtained from the indicator (Fig. 17), a pawl 26 steps a disc 24 fast with the programme drum 1 each time the spacer bar is depressed as the justified line is being typed.